Markdown to HTML Converter
Convert Markdown syntax to clean, semantic HTML with a live preview. Type or paste your Markdown and see it rendered instantly. Perfect for README files, documentation, and blog posts.
Convert Markdown in 3 Steps
Type or paste your Markdown, see it rendered live, and copy the clean HTML output - all in your browser.
Markdown to HTML Converter - Free Online Tool
This Markdown to HTML converter transforms Markdown syntax into clean, semantic HTML in real-time. It runs entirely in your browser with zero external libraries - the parser is built from scratch using a 4-phase regex pipeline for maximum accuracy and reliability.
Whether you're writing README files, documentation, blog posts, or converting existing Markdown content for the web, this tool provides a split-pane editor with live preview, a 15-button syntax toolbar, and one-click HTML copying.
Supported Markdown Syntax
This Tool vs. Other Markdown Converters
| Feature | Basic Converters | This Tool |
|---|---|---|
| Live preview | Sometimes (click-to-convert) | ✓ Real-time as you type |
| Syntax toolbar | Rarely | ✓ 15 quick-insert buttons |
| Table alignment | Sometimes | ✓ :---:, ---:, :--- |
| HTML Source view | Sometimes | ✓ Toggle Preview / Source |
| Tab key behavior | Changes focus | ✓ Inserts 2 spaces |
| External dependencies | Showdown / marked.js | ✓ Zero - custom parser |
| Privacy | Varies (server-side) | ✓ 100% browser-based |
| Mobile support | Basic | ✓ Editor/Preview toggle |
How the Parser Works
The converter uses a custom 4-phase regex pipeline - no external libraries are loaded. This makes it fast, private, and completely self-contained.
Phase 1 - Extraction: Fenced code blocks (```) and inline code (`) are extracted and replaced with unique placeholders before any parsing begins. This prevents code content from being treated as Markdown.
Phase 2 - Block elements: Tables, headings (h6 down to h1), horizontal rules, blockquotes, unordered and ordered lists, and paragraphs are processed in priority order.
Phase 3 - Inline elements: Images, links, bold, italic, and strikethrough are applied. Images are processed before links to prevent syntax collision.
Phase 4 - Restoration: Code placeholders are restored with HTML-escaped content, and output is cleaned up.
Common Use Cases
FAQs – Markdown to HTML Converter
All standard Markdown plus GitHub Flavored Markdown extensions: headings (h1-h6), bold, italic, strikethrough, links, images, code blocks with language classes, inline code, tables with column alignment, unordered and ordered lists, blockquotes, and horizontal rules.
No. The Markdown parser is built entirely from scratch using a custom 4-phase regex pipeline. There are zero external dependencies - no Showdown, no marked.js, no highlight.js. This makes it faster and more private.
Yes. The preview updates on every keystroke using requestAnimationFrame for smooth, debounced rendering. You see changes as you type without clicking any button.
Preview shows the rendered HTML as it would appear in a browser - styled headings, formatted tables, clickable links. HTML Source shows the raw HTML tags so you can see the exact output you'll copy.
The toolbar has 15 buttons for common Markdown syntax. Each button inserts the corresponding syntax at your cursor position. If you have text selected, it wraps the selection with the appropriate markers (like **bold** or *italic*).
Yes. Pressing Tab in the editor inserts 2 spaces instead of moving focus to the next element. This makes it behave more like a proper code editor for writing structured Markdown.
The editor supports up to 200,000 characters. A counter at the bottom-right shows your current usage with amber and red indicators as you approach the limit.
No. All parsing and rendering happens entirely in your browser using JavaScript. Your Markdown content never leaves your device. No data is stored, logged, or transmitted.
Absolutely. Code blocks support language class attributes (like language-javascript) for compatibility with syntax highlighters. All code content is properly HTML-escaped to prevent rendering issues.
Yes. On mobile, the split pane stacks vertically with an Editor/Preview toggle button so you can switch between writing and seeing results without scrolling.
Start Converting Markdown
Write Markdown, see HTML. Live preview, 15 toolbar shortcuts, and one-click copy. Free, private, browser-based.
📝 Open the Editor - It's Free